Noor Hisham Ab Ghani Zulkifli Yusop Mohd Zaki Mat Amin Thian Siaw Yin


This paper evaluates the capability of hydrology method for environmental flow (Eflow) assessment of Johor river basin under non-regulated and regulated conditions due to dam construction. Daily river flow data from 1971 to 2017 was used for the assessment. Generalized extreme value distribution was applied in order to estimate exceedance probabilities associated with historical observation data at different return periods. Environmental water allocations of the river at different ecological conditions were estimated using the intra-annual and inter-annual flows. This study has estimated the hydrological yearly conditions (very dry, dry, average and wet) for the river basin. Moreover, the method has also successfully proposed the environmental water allocations to achieve the desired ecological conditions, which are very good ecological (Eflow class A), good ecological (Eflow class B), medium ecological (Eflow class C), and deficient ecological conditions (Eflow class D). In general, the proposed method has been capable and acceptable for the assessment of Eflow of Johor river basin in line with sustainable water management goal.


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How to Cite
Ab Ghani, N. H., Yusop, Z. ., Mat Amin, M. Z. ., & Siaw Yin, T. . (2022). Hydrology method for environmental flows assessment of Johor River Basin under regulated and non-regulated conditions. Environmental and Toxicology Management, 2(2), 1–3. https://doi.org/10.33086/etm.v2i2.3423
Environmental Flow, Water Allocation, Sustainable Water Management


Arthington, A. H., Kennen, J. G., Stein, E. D. andWebb, J. A., 2018. Recent advances in environmental flows science and water management—Innovation in the Anthropocene. Freshw. Biol. 63, 1022-1034 DOI: https://doi.org/10.1111/fwb.13108

Bassi, N., Kumar, M. D., Sharma, A. and Pardha-Saradhi, P., 2014. Status of wetlands in India: A review of extent, ecosystem

benefits, threats and management strategies J. Hydrol. Reg. Stud. 2, 1-19

Crespo, D., Albiac, J., Kahil, T., Esteban, E. and Baccour, S., 2019. Tradeoffs between water uses and environmental flows: A hydroeconomic analysis in the Ebro basin. Water Resour. Manag. 33, 2301-2317 DOI: https://doi.org/10.1007/s11269-019-02254-3

Hough, I. M.,Warren, P. H. and Shucksmith, J. D., 2019. Designing an environmental flow framework for impounded river systems

through modelling of invertebrate habitat quality. Ecol. Indic. 106, 105445 DOI: https://doi.org/10.1016/j.ecolind.2019.105445

Lani, N. H. M., Syafiuddin, A., Yusop, Z., Adam, U. B. and Amin, M. Z. B. M., 2018a. Performance of small and large scales rainwater

harvesting systems in commercial buildings under different reliability and future water tariff scenarios. Sci. Total Environ. 636, 1171-1179 DOI: https://doi.org/10.1016/j.scitotenv.2018.04.418

Lani, N. H. M., Yusop, Z. and Syafiuddin, A., 2018b. A review of rainwater harvesting in Malaysia: Prospects and challenges. Water. 10, 1-21 DOI: https://doi.org/10.3390/w10040506

Sabzi, H. Z., Rezapour, S., Fovargue, R.,Moreno, H. and Neeson, T. M., 2019. Strategic allocation of water conservation incentives to balance environmental flows and societal outcomes. Ecol. Eng. 127, 160-169 DOI: https://doi.org/10.1016/j.ecoleng.2018.11.005

Shuster,W. D., Bonta, J., Thurston, H.,Warnemuende, E. and Smith, D. R., 2005. Impacts of impervious surface on watershed hydrology: A review. UrbanWater J. 2, 263-275 DOI: https://doi.org/10.1080/15730620500386529

Tachamo Shah, R. D., Sharma, S. and Bharati, L., 2020. Water diversion induced changes in aquatic biodiversity in monsoon dominated rivers of Western Himalayas in Nepal: Implications for environmental flows. Ecol. Indic. 108, 105735 DOI: https://doi.org/10.1016/j.ecolind.2019.105735

VanNiekerk, L., Taljaard, S., Adams, J. B., Lamberth, S. J.,Huizinga, P., Turpie, J. K. and Wooldridge, T. H., 2019. An environmental

flow determination method for integrating multiple-scale ecohydrological and complex ecosystem processes in estuaries. Sci. Total Environ. 656, 482-494 DOI: https://doi.org/10.1016/j.scitotenv.2018.11.276